linker problem for qt5 - qt4 runs ok -> undefined reference to `QWidget::styleChange

I get the following error when I try to use qt5 for compiling - qt4 works fine. I always make sure to do make clean before make

Code:

g++ -Wl,-O1 -o raport main.o mainwindow.o qcgaugewidget.o qcustomplot.o qrc_res_file.o moc_mainwindow.o moc_qcgaugewidget.o moc_qcustomplot.o   -lQt5OpenGL -L/usr/lib64 -lQt5PrintSupport -lQt5Widgets -lQt5Gui -lQt5Network -lQt5Sql -lQt5Xml -lQt5Core -lGL -lpthread 
moc_mainwindow.o:(.data.rel.ro._ZTV10MainWindow[_ZTV10MainWindow]+0x188): undefined reference to `QWidget::styleChange(QStyle&)'
moc_mainwindow.o:(.data.rel.ro._ZTV10MainWindow[_ZTV10MainWindow]+0x190): undefined reference to `QWidget::enabledChange(bool)'
moc_mainwindow.o:(.data.rel.ro._ZTV10MainWindow[_ZTV10MainWindow]+0x198): undefined reference to `QWidget::paletteChange(QPalette const&)'
moc_mainwindow.o:(.data.rel.ro._ZTV10MainWindow[_ZTV10MainWindow]+0x1a0): undefined reference to `QWidget::fontChange(QFont const&)'
moc_mainwindow.o:(.data.rel.ro._ZTV10MainWindow[_ZTV10MainWindow]+0x1a8): undefined reference to `QWidget::windowActivationChange(bool)'
moc_mainwindow.o:(.data.rel.ro._ZTV10MainWindow[_ZTV10MainWindow]+0x1b0): undefined reference to `QWidget::languageChange()'
moc_mainwindow.o:(.data.rel.ro._ZTV11ProgressBar[_ZTV11ProgressBar]+0x188): undefined reference to `QWidget::styleChange(QStyle&)'
moc_mainwindow.o:(.data.rel.ro._ZTV11ProgressBar[_ZTV11ProgressBar]+0x190): undefined reference to `QWidget::enabledChange(bool)'
moc_mainwindow.o:(.data.rel.ro._ZTV11ProgressBar[_ZTV11ProgressBar]+0x198): undefined reference to `QWidget::paletteChange(QPalette const&)'
moc_mainwindow.o:(.data.rel.ro._ZTV11ProgressBar[_ZTV11ProgressBar]+0x1a0): undefined reference to `QWidget::fontChange(QFont const&)'
moc_mainwindow.o:(.data.rel.ro._ZTV11ProgressBar[_ZTV11ProgressBar]+0x1a8): undefined reference to `QWidget::windowActivationChange(bool)'
moc_mainwindow.o:(.data.rel.ro._ZTV11ProgressBar[_ZTV11ProgressBar]+0x1b0): undefined reference to `QWidget::languageChange()'

I have checked what other threads suggested
my .pro looks like this

Code:

# -------------------------------------------------
# Project created by QtCreator 2009-12-02T13:24:40
# -------------------------------------------------
QT += network \
    opengl \
    sql \
    xml \
    gui
greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
greaterThan(QT_MAJOR_VERSION, 4): QT += printsupport
 
TARGET = raport
TEMPLATE = app
SOURCES += main.cpp \
    mainwindow.cpp \
    qcgaugewidget.cpp \
    qcustomplot.cpp
HEADERS += mainwindow.h \
    qcgaugewidget.h \
    qcustomplot.h
FORMS += mainwindow.ui
CONFIG += static
 
RESOURCES += \
    res_file.qrc

and all header files mentioned in .pro contain
#include <QWidget>